"Ea Semper," File in 3 parts: 1) Full Latin text, 2) Background & Commentary, 3) Reaction by the first Eastern Catholic Bishop in the US: Bishop Soter Ortynsky.
Background information from Wikipedia:
Ea Semper was an apostolic letter written by Pope Pius X in September 1907 that dealt with the governance of the Eastern Catholics in the United States. It dealt with the appointment of Stephen Soter Ortynsky as the first bishop of the Ruthenian Catholics in the United States, together with papal instructions concerning his powers and duties. The general constitution of the Greek Rite in America was also published.
Pius' letter created considerable dissatisfaction among the American Greek Rite clergy and laity, since it did not provide for any diocesan authority for their new bishop. Rather, it made him an auxiliary to the Latin Rite bishops, some of whom (such as Bishop John Ireland, for instance) were hostile to the Greek Rite. Furthermore, it also modified several aspects of Greek Catholicism that differed from the Latin Rite. Confirmation was no longer to be conferred at baptism (as in the Greek Orthodox church, from which the Greek Catholics were descended), and could now only be given by a bishop (not a priest, as in the Eastern churches). No new married priests were to be ordained in America or to be sent to America. The pope's missive also mandated changes to the regulations governing marriages between persons in the Latin and Greek rites.
Ea Semper created considerable dissatisfaction among Eastern Catholics in the U.S., and to a lesser extent in Europe. This in turn resulted in many conversions to Russian Orthodoxy, particularly in America; this continued a movement that began in 1892 under St. Alexis Toth, who was later canonized by the Orthodox Church in America. Although critics would insist that Pan Slav nationalism was more to blame for this than genuine religious feeling, a further 80,000 or so would leave Rome for Orthodoxy after publication of the letter. The Orthodox Church in America claims that by 1916, the Roman Catholic church had lost 163 Uniate parishes, with over 100,000 faithful, to the Russian missionary diocese.